Special requirements for x-ray therapy equipment operated at potentials of sixty kv and below

and below (a) Equipment (1) All provisions of section 19-25d-9 (a) apply except, for equipment used for "contact therapy," subdivision (1) in which instance the leakage radiation at the surface of the tube housing shall not exceed one-tenth roentgen per hour. (2) There shall be on the control panel some easily discernible device which will give positive information as to whether or not the tube is energized. (b) Operating procedures (1) Automatic timers shall be provided which will permit accurate presetting and determination of exposures as short as one second. (2) In the therapeutic application of apparatus constructed with beryllium or other low-filtration windows, the owner shall insure that the unfiltered radiation reaches only the part intended and that the useful beam is blocked at all times except when actually being used. (3) Machines having an output of more than one thousand roentgens per minute at any accessible place shall not be left unattended without the power being shut off at the primary disconnecting means. (4) If the tube is hand-held during irradiation, the operator shall wear protective gloves and aprons.